Refrigerator



Nov. 23 1926. 1,607,987

E. KGI

REFRIGERATOR Filed oci. 4. 1922 F @1I 25 :i V f F' .2.

2 HJM. 27 l*y Patented Nov. 23, 1926.

UNITED 'STATES PATENT OFFICE.

EMIL KGI, OF WINTERTHUR, SWITZERLAND.

nnirnicsiwron.

' Application led October 4, 1922, Serial No. 592,188, and in Switzerland August 10, 1922.

- nected to the delivery space of the compressor and containing an oil-separating device. To prevent the assage of oil into. the condenser, this cham er may be provided with transverse walls or partitions.

The liquefied cooling medium is c onveniently collected in a collecting tank disposed adjacent to the condenser, a throttle valve, which is automaticall adjustable according to the liquid leve in the tank, being provided to controlthe amount of cooling el'ected'by the apparatus.

The .-,vapourizer preferably consists of a sheaf of separate tubes, to which the cool` ing fluid is introduced by means of a distributor connected to the throttle valve.

A construction according to the invention is illustrated by way of example in the accompanying drawings, in which` Figure 1 shows the apparatus vation, and

Figure 2 a section on the line II-II of Figure 1. Y 4

The rotary compressor 1 contains a suction space 2, a rotor 3, radially movable vanes 4 a crescent shaped workin space 5, and a delivery space 6. The driving' motor is designated by 7, the condenser by 8, the throttle valve by 9 and the va ourizer by 10.

The connection between t e compressor and the vertically arranged part of the apparatus is formed by the compressor casing which is arranged at right angles to the motor shaft..

The condenser 8 consists of a doublewalled casing, between whose outer andinner walls there is a helical space 11, through which the cooling water passes u wards, a helical ytube 12 being dispo therein, through which the cooling medium tlows downwards in a direction opposite to the eooling'water.A The cooling medium from in side' elethe delivery space 6 is led through the oil separator 13 into a chamber 14, which is arranged inside the condenser helix and in which the separated oil collects, and proceeds therefrom past the transverse walls 15, the o nings 16 and the outer Wall of the cham er 14, through the passage 17 into the tube 12 constituting the condenser. The tube 12 may be made small according to the extent of the pre-cooling effected in the space surrounded by the outer wall of the c amber 14. From the condenser space 12 the cooling medium proceeds in a liquid condition through the passage 18 into the collecting tank 19 containing the throttle valve 9. The transverse walls 15 prevent the lubricating oil colecting in the chamber 14 from passing into the condenser when the machine is tipped. lThe lubricating oil is forced through passages not shown into the bearings of the compressor and into the suction space 2, where it is used for lubricating and sealing purposes. The cooling water is introduced through the passage 20 into the double-walled bottom of the condenser casing,ows therefrom into the conduit 11 and passes through the passave 21 into the compressor cooli space 22, w ience it leaves the apparatus ugh the outlet 23. The outer wall of the condenser casing is made in two parts so as to allow the introduction vof the tube 12 into the conduit 11 and to simplify opening up for the purpose of cleaning the cooling cham r.

The throttle valve consists of two tubular open-ended rotary sliders 24 and 25 disposed one within the other, which are provided with downwardly directed slots opening into the tubel leading to the vapourizer and are connected b means of levers 26 and links 27 to an annu ar float 28. The sliders 24 and 25 are rotated relative to one another by Vmovement of the float, which varies its position accord' to the liquid level in the tank, so that t e cross section of flow through the slots increases with rising li uid level, and conversely, decreases with fal ing liquid level. In this manner the .amount of fluid introduced in unit time to the vapourizer vis automatically controlled according to the condenser ou ut. In lorder to maintain the iioat constan y in a central position, the levers 26 are connected to links 29 to form a parallel linkage, of which the connecting point above the shders moves in a vertical guide30. Counterweights31 are Awhen the liqui connected to the sliders 24- and 25 so as to increase the adusting forcevon the sliders level falls.

The vapourizer consists of a number of separate tubes 32 joined together to formv a sheaf of tubes and closed at the bottom, and the cooling liquid is introduced into them through the passages 34 by means of a distributor 33, connected to the throttleA valve.

and proceeds therefrom into the annular vapourizer space 35 Ybetween the tubes 32 and 34, whence it rises in the form of a vapour into the collecting chamber 36, from which it is drawn through the tube 37 by the compressor. The employment of a vapourizer consisting of separate tubes has the advantages, that' it possesses a great-cooling surface in a compact,v structure and, whilst avoiding excess of material. which would prevent the transfer of heat, has Aan external form which allows a satisfactory,

circulation and simplifies thawing. The distributor 33 may, i desired, be arranged in the lower part of the vapourizer, so that the cooling liquid is leddirectly to the lower end of each separate tube.

The machine operates in the following manner. The cooling medium-sucked inin gaseous form from the vapourizer, leaves the compressor at high pressure and Hows through the oil separator into the pre-cool- -ing chamber and thence into the condenser, where so much heat is withdrawn from 1t by the cooling water that it liquefies. The liquitied cooling medium flows into the collecting tank, whence it proceeds into-the vapourizer after passing the throttle valve. The vapourizer in turn is in communication with the suction space of the compressor,

whereby the cooling medium, owing to the fall of pressure produced, is vapourized and receives heat from outside. The cooling medium may be of any suitable kind.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what l claim is 1. A refrigerator comprsing an internally partitioned unitary casing, a horizontal shaft rotary compressor housed in the uppermost portion of said casing, a vcondenser chamber formed in a' lowcrportion of said casing, a helical condenserarranged y The cooling fluid i's led by the tubesv 34 to the lower end of the vapourizer tubes about the outside of said condenser chamber and connected to the compressor by said unitary casing enclosing` the suction and pressure passages of said compressor, an evaporator disposed beneath said casing and connected to said condenser through a refrigerant storage chamber formed in aA still 'lower portion of said casing, and a throttle valve in said storage chamber for controlling the passageof refrigerant to said evaporator in accordance with the level of the liquid in the storage chamber.

2. A refrigerator in accordance with claim 1 in which the condenser comprises an auxiliary casing whichconstitutes, with the unitary casing ofclaim 1, a double wall structure, the walls of said structure formf ingr between thema helical passage for the cooling medium, and a coiled pipe located in said passage and lin which thc refrigerant is condensed.

3. A refrigerator 'in accordance. with claim 1 in which the condenser comprises an auxiliary casing which consists with the unitary casing of claim. a double wall structure, the walls of said structure forming between them a helical passage for the cooling medium, a coiled pipe located in said passage and in-which the refrigerant is.con

densed and an oil separator located within the space surrounded by the condenser coil, si-zd. spa e being 1n communicatlon with the pressure side ofthe compressor and also pressure side of the compressor and also with the interior of the condenser coil, and transversely extending partitions located between the oil separator and the condenser coil to prevent the oil collected by the se arator from passing into the condenser' w en the machine is tilted. v

In testimony whereof I have` affixed my signature. y

EMIL KAGI. 

